Ophthalmic lenses, dioptric formulae for combined cylindrical lenses : the prism-dioptry, and other optical papers (1907)
Prentice, Charles F. (Charles Frederick), b. 1854 · Philadelphia : Keystone · leaf 47
Fig. 33. Fig. 34. Such a surface, called a torus, is shown in Fig, 33, wherein the curva-ture c^ of the radius r^ and refraction 3D. is rotated upon a vertical axis Rso as to create the curvature c^ whose radius r- is chosen to produce 2D. In Fig. 34 two lenses are shown to be included w^ithin the…
Lenses · Prisms (Ophthalmology)
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